/Engine/Source/Editor/SkeletonEditor/Public/IEditableSkeleton.h
Rename a socket on the mesh or the skeleton
void RenameSocket ( const [FName](API\Runtime\Core\UObject\FName) OldSocketName, const [FName](API\Runtime\Core\UObject\FName) NewSocketName, [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * InSkeletalMesh )